um, that might be true except it 'might' be someone trolling, which is very common.
they jump you like they are Kato in a Pink Panther Film, and the wrestle you and see what you are all about. Then when they have concluded their 'test' of you they either do an 'I solute you' or they reveal that you were trolled. They aren't shills, they are more like 'trainers'. The difference: they aren't there to hurt but just to see what you are all about.